IF with two variables

[geosite]

I have a database that stores the dates various public officials held office. The dates fall into three categories:

$TermB - the year their term began
$TermE - the year their term ended
$TermM - any particular year they happened to occupy office; I display this if I lack more detailed information

Ideally, I want to display this:

1978-1982

But if I have just the beginning date, my display looks like this:

1978-

If I only had the ending date, it would look like this:

-1982

And if I don't know when their term began or ended, but I do know that they held office in 1980, I might display something like this:

?-1980-?

The script below handles situations where I have both a beginning and ending date, a beginning date only or neither a beginning or ending date. How can I modify it so that it also handles situations where I have an ending date only?

In other words, how can I change it so the first line says "If either $TermB OR $TermE is not empty...?

Thanks.

if($TermB -- !'')
 { $Term = ''.$TermB.'-'.$TermE.''; }
else
 { $Term = $TermM; } 

[byron3@earthlink]

iF ( !empty(TermB) || !empty(TermE) ){

/* Your processing code goes here */

} 

[geosite]

Thanks.